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45 lines
1.5 KiB
45 lines
1.5 KiB
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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// This file provides a wrapper for getenv that appends the userid (geteuid())
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// of the current process to GCOV_PREFIX. This avoids conflicts and permissions
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// issues when different processes try to create/access the same directories and
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// files under $GCOV_PREFIX.
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//
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// When this file is linked to a binary, the -Wl,--wrap,getenv flag must be
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// used. The linker redirects calls to getenv to __wrap_getenv and sets
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// __real_getenv to point to libc's getenv.
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char *__real_getenv(const char *name);
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static char modified_gcov_prefix[128];
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__attribute__((weak)) char *__wrap_getenv(const char *name) {
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if (strcmp(name, "GCOV_PREFIX") != 0) {
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return __real_getenv(name);
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}
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sprintf(modified_gcov_prefix, "%s/%u", __real_getenv(name), geteuid());
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mkdir(modified_gcov_prefix, 0777);
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return modified_gcov_prefix;
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}
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